Puncture device and puncture needle cartridge
3 Assignments
0 Petitions
Accused Products
Abstract
A puncture device is constituted such that a plunger (2) is provided with a lever (3) which is partially restricted in rotation, and a forward urging force is obtained by a contraction restorative force of a tension spring (4), and the tension spring (4) is again expanded with the lever (3) as a leverage when the plunger (2) further moves forward due to its inertia from a position where no urging force is not applied, and the plunger (2) is urged backward by a restorative force of the re-expansion. Further, a puncture needle cartridge is provided with a lancet body (203) having a puncture needle, and a puncture needle holder (201) in which the lancet body (203) is movably stored, and further, the lancet body (203) has an arm means (302) and the puncture needle holder (201) contains a to-be-latched means (303) that cooperates with the arm means (302). Thereby, the fabrication process is simplified, and plural times of punctures of the puncture needle is prevented, and further, the puncture speed is controlled, and moreover, the used puncture needle is discarded safely.
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Citations
9 Claims
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1-4. -4. (canceled)
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5. A puncture needle cartridge comprising:
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a lancet comprising a lancet body having a puncture needle and a puncture needle protection cap for protecting the puncture needle, and a puncture needle holder which has an opening and which holds the lancet body so that the lancet body is movable in the holder, wherein said lancet body further includes an arm means shaped such that one end thereof is connected to the lancet body while the other end is opened so as to be broadened toward the front end of the lancet body, wherein the arm means is elastically deformable outward or toward the center of the lancet body; said puncture needle holder is a cylindrical holder which has a to-be-latched means that cooperates with the arm means, and which holds the lancet body movably along its axial direction, from an initial position of the lancet body where the arm means is positioned behind the to-be-latched means or from a first position as a puncture preparation position to a second position where the puncture needle protrudes, wherein an outer diameter at one end of the puncture needle holder is larger than the outer diameter at the other end of the puncture needle holder; when said lancet body moves from the first position along the puncture direction, said arm means operates in conjunction with the to-be-latched means of the puncture needle holder and elastically deforms outwardly from the lancet body, and the to-be-latched means contacts said one end of the arm means whereby movement of the lancet body in the puncture direction is stopped; when said puncture needle cartridge is inserted into the puncture device from the rear end of the lancet body, said arm means is engaged with the housing of the puncture device, and elastically deforms toward the center of the lancet body so that it does not cooperate with the to-be-latched means of the puncture needle holder, and thereby the lancet body moves from the first position to the second position to perform puncture operation; and after the puncture is completed, when removing the puncture needle cartridge from the puncture device, the puncture needle cartridge is pulled and thereby the lancet body and the puncture needle holder move apart from each other, and the lancet body returns to the first position from a third position which is a puncture end position, and when the puncture needle cartridge is further pulled, the engagement of the arm means with the housing of the puncture device is released and the elastic deformation of the arm means toward the center of the lancet body is released. - View Dependent Claims (6, 7, 8, 9)
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Specification